Traumatic injuries are always inevitable in life and sometimes it is difficult to avoid fracture surgery. We can often see that the same fracture and the same surgeon perform the surgery, but the recovery results are very different. Some people may recover as normal, while others miss the best time and are left with stiff joints, dysfunction and lifelong regrets. One of the most important reasons is that the postoperative functional exercise has not kept up, in other words, it is not in the formal functional exercise. Therefore, it is extremely important to understand the formal exercise after fracture surgery. The formal treatment principle of fracture: reset, fixation, rehabilitation (functional exercise), functional exercise is an important factor to promote the healing of fracture, often maintain the normal function of muscles, maintain a certain amount of joint activity, can effectively prevent bone quality osteoporosis, increase blood circulation, conducive to the formation of bone scabs, the same can also delay or reduce the degenerative changes of the joint. The first stage (l-2 weeks after injury) is the period of receding inflammation. Local swelling, pain, mostly postoperative plaster or other external fixation, soft tissue is in the repair stage, the purpose of functional exercise is to promote blood circulation, so that the swelling subsides as soon as possible, to prevent muscle atrophy and joint adhesions. The main form of functional exercise in this period is to make the affected muscles stretch and contract. Patients with upper limb fractures can make fist clenching and shoulder lifting activities, making the whole upper limb muscles exert force when making fist clenching and then relaxing, and using the other hand to hold the forearm of the affected limb for shoulder joint circumduction activities. Patients with lower extremity fractures can contract the quadriceps muscles to make the whole lower extremity muscles exert and then relax, but not necessarily flex the knee joint. Patients with ankle fractures can do some toe dorsiflexion. The second stage (3-4 weeks after injury) is the period of bone scab formation. The swelling of the affected limb subsides, the local pain gradually disappears, the soft tissue damage is gradually repaired, some patients have their external fixation removed, the fracture ends are partially fibrously connected and gradually forming bone scabs, and the fracture site becomes more stable. In addition to the muscle stretching and contraction activities of the affected limb, the functional exercises of the joints near the fracture can be carried out gradually under the guidance of the physician; in addition to fist clenching and shoulder joint movements, patients with upper limb fractures can also do some active joint extension and flexion activities, such as wrist and elbow joints, and the extension and flexion, abduction and adduction of the whole upper limb, starting with simple movements and gradually increasing, with gentle movements. As the fracture heals, the number of activities can be increased appropriately. Patients with lower extremity fractures can perform leg lifting and hip extension and flexion activities, and can combine upper and lower extremities to climb and stand, and gradually start light weight-bearing activities. After the 4th week, patients with femur fracture of lower extremity can support the bed with both hands, do hip lifting, hip extension and knee flexion. After 4-6 weeks, the patient can get up and move around with the help of crutches according to medical advice, but cannot bear weight. The third stage (5-7 weeks after injury) is the period of bone scab maturation. At this time, the soft tissues of the affected area have returned to normal, the muscles are strong, there is enough bone scab, the external fixation has generally been removed, and the clinical healing is generally approaching, except for a certain aspect of joint movement that is not conducive to fracture healing still needs to be restricted, other activities can be carried out, and the number and range of activities can be expanded. The fourth stage (7-10 weeks after injury) is the clinical healing period. The main form of functional exercise is to strengthen the active movement of the joints of the affected limb, so that the joints can quickly resume normal activities. Patients with upper limb fracture can do some light work within their ability. Patients with lower limb fractures can go up and down slopes, go up and down stairs, and do some weight-bearing activities under the protection of crutches or canes. In conclusion, formal functional exercise is extremely important. Active and effective functional exercise may restore you to your original condition, but on the contrary, it may make you regret for the rest of your life.